TimeSplitters: Future Perfect.
A nice singleplayer mode, with some missions to acccomplish.
Also a great multiplayer option, which you can play for loads and loads of hours
And some tasks you can complete.. I don't know the name. Like: "Kill 10 bots within 3 minutes". Get them all on gold, it's damn hard
MK7!! 3DS friend code: 0688 - 5579 - 0994
Also playing DotA2 beta!